Bingo. One aspect of this is sleep (quantity and quality). The drop in testosterone is likely multifactorial though: sleep, nutrition, movement, stress -> all contributors that have the potential to decrease testosterone levels and creat hormone imbalances.

Stress is also on the rise, especially among gen Z:

https://www.apa.org/news/press/releases/stress/2020/report-o...

Which shouldn't be surprising given the quality of life a typical worker enjoys today vs in decades past when cost of living was much more in line with wages.

Also, having recently watched The Social Dilemma, social media might be stressing people out too.